Add pbdr@ and pragyabajoria@ to the OWNERS file for the Shell submodule.

xutan@google.com

pbdr@google.com

pragyabajoria@google.com

# Give submodule owners in shell resource approval

per-file res*/*/*.xml = atsjenk@google.com, hwwang@google.com, jorgegil@google.com, lbill@google.com, madym@google.com, vaniadesmonda@google.com, pbdr@google.com, tkachenkoi@google.com, mpodolian@google.com, liranb@google.com, pragyabajoria@google.com, uysalorhan@google.com, gsennton@google.com, mattsziklay@google.com, mdehaini@google.com